I'm in the world-building camp. I've dropped a few 7K stories. In fact, Take My Breath Away is so long that there will be at least 4 parts. As far as the "Get to the sex" camp, take that with a grain of salt. For every person who says, " Let Jim fuck Jill, there is another one or two who want to know WHY Jim is fucking Jill.
The advice to keep them short is positive; 1500-3000 words is right (based on the stories I have done and the views they have garnered). I will give you 2 bits of advice: Don't use AI, the mods know, and a lot of readers know. 2. Write what you want to write and how you want to write it. If you are not enjoying the writing "to fit in," then honestly, don't, if it doesn't make you happy